Repiping in Herndon, VA

Herndon conditions

The Town of Herndon runs its own water and sewer utility inside town limits and buys its drinking water from Fairfax Water, mostly from the Corbalis plant on the Potomac. Results from that plant average about 7.5 grains per gallon of hardness, enough to build scale at fittings over time. The Town keeps a service line inventory that classifies lines as non-lead, galvanized, galvanized requiring replacement, or unknown, and it reports that no lead service lines have been found.

Herndon mailing addresses also reach into unincorporated Fairfax County, including areas south of the Dulles Toll Road. Those homes are generally on Fairfax Water and fall under Fairfax County for permits. Housing around the historic downtown is older, while much of the rest went up in the 1970s through the 1990s.

Inside town limits vs. outside

Your water bill is the quickest way to tell which column you're in.

Signs it's time

• Small leaks recurring on copper in different rooms
• Galvanized steel at the water heater or main shutoff
• Gray plastic lines with crimp-ring fittings
• Fixtures that lose pressure when another one runs
• Rusty or cloudy water after a few days away

Timing and seasonal notes

Repipes can be scheduled year-round, but it's smart to replace failing lines in exterior walls and crawlspaces before winter, since that's where old pipe is most likely to freeze and split. Spring is a good window for work in finished basements before summer storms keep everyone indoors. If the Town's inventory lists your line as galvanized, ask the plumber whether to replace it alongside the indoor pipe.

Older homes near the historic downtown deserve an extra look, since decades of partial repairs can leave short pieces of steel or mismatched fittings hidden in walls. A plumber who traces each run back to the main can make sure the new system doesn't tie into a leftover stretch of old pipe.